doc: Added title. Suppresses no title warning messages.

Signed-off-by: John Wilkins <john.wilkins@inktank.com>
doc: Modified pre-flight checklist for ceph-deploy packages.

fixes: #5253
doc: Removed ceph-deploy git, and added ceph-deploy packages.

fixes: #5253

Signed-off-by: John Wilkins <john.wilkins@inktank.com>